你看過高架水橋嗎?

Have you ever seen a river over a river? AMAZING..... 你見過一條河橋跨過另一條河流嗎？即使你看到它，仍然是很難相信！水橋在德國 - 是個什麼樣的工程壯舉啊！六年來​​，500萬歐元，918米長........
Even after you see it, it is still hard to believe! Water Bridge in Germany. What a feat! Six years, 500 million Euros, 918 meters long . . . now this is engineering! This is a channel-bridge over the River Elbe and joins the former East and West Germany , As part of the unification project. It is located in the city of Magdeburg , near Berlin . The photo was taken on the day of inauguration . . . To those who appreciate engineering projects, here's a puzzle for your armchair engineers . . .  and physicists.
Question: Did that bridge have to be designed to withstand the additional weight of ship and barge traffic, Or just the weight of the water?
Answer: It only needs to be designed to withstand the weight of the water!
Why? : A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded.

The Elbe-Havel (易北河 - 哈維爾運河)and Mittelland canals had previously met near Magdeburg but on opposite sides of the Elbe. Ships moving between the two had to make a 12-kilometer detour, descending from the Mittelland Canal through the Rothensee boat lift into the Elbe, then sailing downstream on the river, before entering the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often prevented fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo.

Construction of the water link was started as early as in the 1930s but due to the World War 2 and subsequent division of Germany the work remained suspended till 1997. The aqueduct was finally completed and opened to the public in 2003. 建水的聯繫始於早在20世紀 1930年，但由於​​第二次世界大戰和隨後的德國分裂工作只好暫停，直到1997年才再繼續興建，該渡槽終於2003年完成，最終可以向公眾開放使用。

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